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From-SVN: r571
This commit is contained in:
Richard Kenner 1992-03-22 17:38:23 -05:00
parent 13a07c7126
commit c160c628f1
1 changed files with 45 additions and 7 deletions
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52
gcc/loop.c
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@ -1458,6 +1458,34 @@ rtx_equal_for_loop_p (x, y, movables)
return 1; return 1;
} }
/* If X contains any LABEL_REF's, add REG_LABEL notes for them to all
insns in INSNS which use thet reference. */
static void
add_label_notes (x, insns)
rtx x;
rtx insns;
{
enum rtx_code code = GET_CODE (x);
int i;
char *fmt;
rtx insn;
if (code == LABEL_REF)
{
for (insn = insns; insn; insn = NEXT_INSN (insn))
if (reg_mentioned_p (XEXP (x, 0), insn))
REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_LABEL, XEXP (x, 0),
REG_NOTES (insn));
return;
}
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
if (fmt[i] == 'e')
add_label_notes (XEXP (x, i), insns);
}
/* Scan MOVABLES, and move the insns that deserve to be moved. /* Scan MOVABLES, and move the insns that deserve to be moved.
If two matching movables are combined, replace one reg with the If two matching movables are combined, replace one reg with the
other throughout. */ other throughout. */
@ -1635,10 +1663,12 @@ move_movables (movables, threshold, insn_count, loop_start, end, nregs)
start_sequence (); start_sequence ();
emit_move_insn (m->set_dest, m->set_src); emit_move_insn (m->set_dest, m->set_src);
temp = gen_sequence (); temp = get_insns ();
end_sequence (); end_sequence ();
i1 = emit_insn_before (temp, loop_start); add_label_notes (m->set_src, temp);
i1 = emit_insns_before (temp, loop_start);
if (! find_reg_note (i1, REG_EQUAL, 0)) if (! find_reg_note (i1, REG_EQUAL, 0))
REG_NOTES (i1) REG_NOTES (i1)
= gen_rtx (EXPR_LIST, = gen_rtx (EXPR_LIST,
@ -4504,11 +4534,19 @@ update_giv_derive (p)
be able to compute a compensation. */ be able to compute a compensation. */
else if (biv->insn == p) else if (biv->insn == p)
{ {
if (biv->mult_val == const1_rtx tem = 0;
&& (tem = simplify_giv_expr (gen_rtx (MULT, giv->mode,
biv->add_val, if (biv->mult_val == const1_rtx)
giv->mult_val), tem = simplify_giv_expr (gen_rtx (MULT, giv->mode,
&dummy))) biv->add_val,
giv->mult_val),
&dummy);
if (tem && giv->derive_adjustment)
tem = simplify_giv_expr (gen_rtx (PLUS, giv->mode, tem,
giv->derive_adjustment),
&dummy);
if (tem)
giv->derive_adjustment = tem; giv->derive_adjustment = tem;
else else
giv->cant_derive = 1; giv->cant_derive = 1;